Regardless of what form symptoms take (SKIN RASH, tingling around the MOUTH, DIARRHEA), a type I hypersensitivity reaction is a systemic response-it affects and involves the body as a whole.
How to Read Your Eyeglass Prescription. The first step to understanding your eyeglass prescription is knowing what OD and OS mean. They are abbreviations for oculus dexter and oculus sinister, which are Latin terms for right eye and left eye.
In the United States, you need a written prescription to buy contact lenses. The prescription form will list measurements for each eye under columns labeled OD and OS.. OD is an abbreviation for the Latin term oculus dexter, or right eye. OS is short for oculus sinister, or left eye.